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/usr/lib/ruby/vendor_ruby/net/ssh/verifiers/null.rb is in ruby-net-ssh 1:3.2.0-1.

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module Net; module SSH; module Verifiers

  # The Null host key verifier simply allows every key it sees, without
  # bothering to verify. This is simple, but is not particularly secure.
  class Null
    # Returns true.
    def verify(arguments)
      true
    end
  end

end; end; end